In MyClass.pm:
{
package MyClass;
use mymodule;

# call some function from mymodule
}

##</code><code>##

In myapp.pl:
use mymodule;

# call some function from mymodule

##</code><code>##

#!/usr/bin/perl -w

use strict;
use warnings;

{
    package MyClass;
    use Class::Contract;
    use test_func;

    contract {
        attr 'test';

        ctor 'new';
        impl {
            ${self->test} = test_me('within class');
        };
    };
};


package main;
use test_func;

test_me('in main');

##</code><code>##

sub test_me {
    my $txt = shift;
    print "Exec of test_me with: $txt\n";
    return $txt;
}

1;

##</code><code>##

Undefined subroutine &main::test_me called at test_loading.pl line 25